1 /*
2 * arch/arm/mach-ixp4xx/common.c
3 *
4 * Generic code shared across all IXP4XX platforms
5 *
6 * Maintainer: Deepak Saxena <dsaxena@plexity.net>
7 *
8 * Copyright 2002 (c) Intel Corporation
9 * Copyright 2003-2004 (c) MontaVista, Software, Inc.
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
16 #include <linux/kernel.h>
17 #include <linux/mm.h>
18 #include <linux/init.h>
19 #include <linux/serial.h>
20 #include <linux/sched.h>
21 #include <linux/tty.h>
22 #include <linux/platform_device.h>
23 #include <linux/serial_core.h>
24 #include <linux/interrupt.h>
25 #include <linux/bitops.h>
26 #include <linux/time.h>
27 #include <linux/timex.h>
28 #include <linux/clocksource.h>
29 #include <linux/clockchips.h>
30 #include <linux/io.h>
31
32 #include <mach/udc.h>
33 #include <mach/hardware.h>
34 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
36 #include <asm/page.h>
37 #include <asm/irq.h>
38 #include <asm/sched_clock.h>
39
40 #include <asm/mach/map.h>
41 #include <asm/mach/irq.h>
42 #include <asm/mach/time.h>
43
44 static void __init ixp4xx_clocksource_init(void);
45 static void __init ixp4xx_clockevent_init(void);
46 static struct clock_event_device clockevent_ixp4xx;
47
48 /*************************************************************************
49 * IXP4xx chipset I/O mapping
50 *************************************************************************/
51 static struct map_desc ixp4xx_io_desc[] __initdata = {
52 { /* UART, Interrupt ctrl, GPIO, timers, NPEs, MACs, USB .... */
53 .virtual = IXP4XX_PERIPHERAL_BASE_VIRT,
54 .pfn = __phys_to_pfn(IXP4XX_PERIPHERAL_BASE_PHYS),
55 .length = IXP4XX_PERIPHERAL_REGION_SIZE,
56 .type = MT_DEVICE
57 }, { /* Expansion Bus Config Registers */
58 .virtual = IXP4XX_EXP_CFG_BASE_VIRT,
59 .pfn = __phys_to_pfn(IXP4XX_EXP_CFG_BASE_PHYS),
60 .length = IXP4XX_EXP_CFG_REGION_SIZE,
61 .type = MT_DEVICE
62 }, { /* PCI Registers */
63 .virtual = IXP4XX_PCI_CFG_BASE_VIRT,
64 .pfn = __phys_to_pfn(IXP4XX_PCI_CFG_BASE_PHYS),
65 .length = IXP4XX_PCI_CFG_REGION_SIZE,
66 .type = MT_DEVICE
67 },
68 #ifdef CONFIG_DEBUG_LL
69 { /* Debug UART mapping */
70 .virtual = IXP4XX_DEBUG_UART_BASE_VIRT,
71 .pfn = __phys_to_pfn(IXP4XX_DEBUG_UART_BASE_PHYS),
72 .length = IXP4XX_DEBUG_UART_REGION_SIZE,
73 .type = MT_DEVICE
74 }
75 #endif
76 };
77
ixp4xx_map_io(void)78 void __init ixp4xx_map_io(void)
79 {
80 iotable_init(ixp4xx_io_desc, ARRAY_SIZE(ixp4xx_io_desc));
81 }
82
83
84 /*************************************************************************
85 * IXP4xx chipset IRQ handling
86 *
87 * TODO: GPIO IRQs should be marked invalid until the user of the IRQ
88 * (be it PCI or something else) configures that GPIO line
89 * as an IRQ.
90 **************************************************************************/
91 enum ixp4xx_irq_type {
92 IXP4XX_IRQ_LEVEL, IXP4XX_IRQ_EDGE
93 };
94
95 /* Each bit represents an IRQ: 1: edge-triggered, 0: level triggered */
96 static unsigned long long ixp4xx_irq_edge = 0;
97
98 /*
99 * IRQ -> GPIO mapping table
100 */
101 static signed char irq2gpio[32] = {
102 -1, -1, -1, -1, -1, -1, 0, 1,
103 -1, -1, -1, -1, -1, -1, -1, -1,
104 -1, -1, -1, 2, 3, 4, 5, 6,
105 7, 8, 9, 10, 11, 12, -1, -1,
106 };
107
gpio_to_irq(int gpio)108 int gpio_to_irq(int gpio)
109 {
110 int irq;
111
112 for (irq = 0; irq < 32; irq++) {
113 if (irq2gpio[irq] == gpio)
114 return irq;
115 }
116 return -EINVAL;
117 }
118 EXPORT_SYMBOL(gpio_to_irq);
119
irq_to_gpio(unsigned int irq)120 int irq_to_gpio(unsigned int irq)
121 {
122 int gpio = (irq < 32) ? irq2gpio[irq] : -EINVAL;
123
124 if (gpio == -1)
125 return -EINVAL;
126
127 return gpio;
128 }
129 EXPORT_SYMBOL(irq_to_gpio);
130
ixp4xx_set_irq_type(struct irq_data * d,unsigned int type)131 static int ixp4xx_set_irq_type(struct irq_data *d, unsigned int type)
132 {
133 int line = irq2gpio[d->irq];
134 u32 int_style;
135 enum ixp4xx_irq_type irq_type;
136 volatile u32 *int_reg;
137
138 /*
139 * Only for GPIO IRQs
140 */
141 if (line < 0)
142 return -EINVAL;
143
144 switch (type){
145 case IRQ_TYPE_EDGE_BOTH:
146 int_style = IXP4XX_GPIO_STYLE_TRANSITIONAL;
147 irq_type = IXP4XX_IRQ_EDGE;
148 break;
149 case IRQ_TYPE_EDGE_RISING:
150 int_style = IXP4XX_GPIO_STYLE_RISING_EDGE;
151 irq_type = IXP4XX_IRQ_EDGE;
152 break;
153 case IRQ_TYPE_EDGE_FALLING:
154 int_style = IXP4XX_GPIO_STYLE_FALLING_EDGE;
155 irq_type = IXP4XX_IRQ_EDGE;
156 break;
157 case IRQ_TYPE_LEVEL_HIGH:
158 int_style = IXP4XX_GPIO_STYLE_ACTIVE_HIGH;
159 irq_type = IXP4XX_IRQ_LEVEL;
160 break;
161 case IRQ_TYPE_LEVEL_LOW:
162 int_style = IXP4XX_GPIO_STYLE_ACTIVE_LOW;
163 irq_type = IXP4XX_IRQ_LEVEL;
164 break;
165 default:
166 return -EINVAL;
167 }
168
169 if (irq_type == IXP4XX_IRQ_EDGE)
170 ixp4xx_irq_edge |= (1 << d->irq);
171 else
172 ixp4xx_irq_edge &= ~(1 << d->irq);
173
174 if (line >= 8) { /* pins 8-15 */
175 line -= 8;
176 int_reg = IXP4XX_GPIO_GPIT2R;
177 } else { /* pins 0-7 */
178 int_reg = IXP4XX_GPIO_GPIT1R;
179 }
180
181 /* Clear the style for the appropriate pin */
182 *int_reg &= ~(IXP4XX_GPIO_STYLE_CLEAR <<
183 (line * IXP4XX_GPIO_STYLE_SIZE));
184
185 *IXP4XX_GPIO_GPISR = (1 << line);
186
187 /* Set the new style */
188 *int_reg |= (int_style << (line * IXP4XX_GPIO_STYLE_SIZE));
189
190 /* Configure the line as an input */
191 gpio_line_config(irq2gpio[d->irq], IXP4XX_GPIO_IN);
192
193 return 0;
194 }
195
ixp4xx_irq_mask(struct irq_data * d)196 static void ixp4xx_irq_mask(struct irq_data *d)
197 {
198 if ((cpu_is_ixp46x() || cpu_is_ixp43x()) && d->irq >= 32)
199 *IXP4XX_ICMR2 &= ~(1 << (d->irq - 32));
200 else
201 *IXP4XX_ICMR &= ~(1 << d->irq);
202 }
203
ixp4xx_irq_ack(struct irq_data * d)204 static void ixp4xx_irq_ack(struct irq_data *d)
205 {
206 int line = (d->irq < 32) ? irq2gpio[d->irq] : -1;
207
208 if (line >= 0)
209 *IXP4XX_GPIO_GPISR = (1 << line);
210 }
211
212 /*
213 * Level triggered interrupts on GPIO lines can only be cleared when the
214 * interrupt condition disappears.
215 */
ixp4xx_irq_unmask(struct irq_data * d)216 static void ixp4xx_irq_unmask(struct irq_data *d)
217 {
218 if (!(ixp4xx_irq_edge & (1 << d->irq)))
219 ixp4xx_irq_ack(d);
220
221 if ((cpu_is_ixp46x() || cpu_is_ixp43x()) && d->irq >= 32)
222 *IXP4XX_ICMR2 |= (1 << (d->irq - 32));
223 else
224 *IXP4XX_ICMR |= (1 << d->irq);
225 }
226
227 static struct irq_chip ixp4xx_irq_chip = {
228 .name = "IXP4xx",
229 .irq_ack = ixp4xx_irq_ack,
230 .irq_mask = ixp4xx_irq_mask,
231 .irq_unmask = ixp4xx_irq_unmask,
232 .irq_set_type = ixp4xx_set_irq_type,
233 };
234
ixp4xx_init_irq(void)235 void __init ixp4xx_init_irq(void)
236 {
237 int i = 0;
238
239 /* Route all sources to IRQ instead of FIQ */
240 *IXP4XX_ICLR = 0x0;
241
242 /* Disable all interrupt */
243 *IXP4XX_ICMR = 0x0;
244
245 if (cpu_is_ixp46x() || cpu_is_ixp43x()) {
246 /* Route upper 32 sources to IRQ instead of FIQ */
247 *IXP4XX_ICLR2 = 0x00;
248
249 /* Disable upper 32 interrupts */
250 *IXP4XX_ICMR2 = 0x00;
251 }
252
253 /* Default to all level triggered */
254 for(i = 0; i < NR_IRQS; i++) {
255 irq_set_chip_and_handler(i, &ixp4xx_irq_chip,
256 handle_level_irq);
257 set_irq_flags(i, IRQF_VALID);
258 }
259 }
260
261
262 /*************************************************************************
263 * IXP4xx timer tick
264 * We use OS timer1 on the CPU for the timer tick and the timestamp
265 * counter as a source of real clock ticks to account for missed jiffies.
266 *************************************************************************/
267
ixp4xx_timer_interrupt(int irq,void * dev_id)268 static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
269 {
270 struct clock_event_device *evt = dev_id;
271
272 /* Clear Pending Interrupt by writing '1' to it */
273 *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
274
275 evt->event_handler(evt);
276
277 return IRQ_HANDLED;
278 }
279
280 static struct irqaction ixp4xx_timer_irq = {
281 .name = "timer1",
282 .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
283 .handler = ixp4xx_timer_interrupt,
284 .dev_id = &clockevent_ixp4xx,
285 };
286
ixp4xx_timer_init(void)287 void __init ixp4xx_timer_init(void)
288 {
289 /* Reset/disable counter */
290 *IXP4XX_OSRT1 = 0;
291
292 /* Clear Pending Interrupt by writing '1' to it */
293 *IXP4XX_OSST = IXP4XX_OSST_TIMER_1_PEND;
294
295 /* Reset time-stamp counter */
296 *IXP4XX_OSTS = 0;
297
298 /* Connect the interrupt handler and enable the interrupt */
299 setup_irq(IRQ_IXP4XX_TIMER1, &ixp4xx_timer_irq);
300
301 ixp4xx_clocksource_init();
302 ixp4xx_clockevent_init();
303 }
304
305 struct sys_timer ixp4xx_timer = {
306 .init = ixp4xx_timer_init,
307 };
308
309 static struct pxa2xx_udc_mach_info ixp4xx_udc_info;
310
ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info * info)311 void __init ixp4xx_set_udc_info(struct pxa2xx_udc_mach_info *info)
312 {
313 memcpy(&ixp4xx_udc_info, info, sizeof *info);
314 }
315
316 static struct resource ixp4xx_udc_resources[] = {
317 [0] = {
318 .start = 0xc800b000,
319 .end = 0xc800bfff,
320 .flags = IORESOURCE_MEM,
321 },
322 [1] = {
323 .start = IRQ_IXP4XX_USB,
324 .end = IRQ_IXP4XX_USB,
325 .flags = IORESOURCE_IRQ,
326 },
327 };
328
329 /*
330 * USB device controller. The IXP4xx uses the same controller as PXA25X,
331 * so we just use the same device.
332 */
333 static struct platform_device ixp4xx_udc_device = {
334 .name = "pxa25x-udc",
335 .id = -1,
336 .num_resources = 2,
337 .resource = ixp4xx_udc_resources,
338 .dev = {
339 .platform_data = &ixp4xx_udc_info,
340 },
341 };
342
343 static struct platform_device *ixp4xx_devices[] __initdata = {
344 &ixp4xx_udc_device,
345 };
346
347 static struct resource ixp46x_i2c_resources[] = {
348 [0] = {
349 .start = 0xc8011000,
350 .end = 0xc801101c,
351 .flags = IORESOURCE_MEM,
352 },
353 [1] = {
354 .start = IRQ_IXP4XX_I2C,
355 .end = IRQ_IXP4XX_I2C,
356 .flags = IORESOURCE_IRQ
357 }
358 };
359
360 /*
361 * I2C controller. The IXP46x uses the same block as the IOP3xx, so
362 * we just use the same device name.
363 */
364 static struct platform_device ixp46x_i2c_controller = {
365 .name = "IOP3xx-I2C",
366 .id = 0,
367 .num_resources = 2,
368 .resource = ixp46x_i2c_resources
369 };
370
371 static struct platform_device *ixp46x_devices[] __initdata = {
372 &ixp46x_i2c_controller
373 };
374
375 unsigned long ixp4xx_exp_bus_size;
376 EXPORT_SYMBOL(ixp4xx_exp_bus_size);
377
ixp4xx_sys_init(void)378 void __init ixp4xx_sys_init(void)
379 {
380 ixp4xx_exp_bus_size = SZ_16M;
381
382 platform_add_devices(ixp4xx_devices, ARRAY_SIZE(ixp4xx_devices));
383
384 if (cpu_is_ixp46x()) {
385 int region;
386
387 platform_add_devices(ixp46x_devices,
388 ARRAY_SIZE(ixp46x_devices));
389
390 for (region = 0; region < 7; region++) {
391 if((*(IXP4XX_EXP_REG(0x4 * region)) & 0x200)) {
392 ixp4xx_exp_bus_size = SZ_32M;
393 break;
394 }
395 }
396 }
397
398 printk("IXP4xx: Using %luMiB expansion bus window size\n",
399 ixp4xx_exp_bus_size >> 20);
400 }
401
402 /*
403 * sched_clock()
404 */
405 static DEFINE_CLOCK_DATA(cd);
406
sched_clock(void)407 unsigned long long notrace sched_clock(void)
408 {
409 u32 cyc = *IXP4XX_OSTS;
410 return cyc_to_sched_clock(&cd, cyc, (u32)~0);
411 }
412
ixp4xx_update_sched_clock(void)413 static void notrace ixp4xx_update_sched_clock(void)
414 {
415 u32 cyc = *IXP4XX_OSTS;
416 update_sched_clock(&cd, cyc, (u32)~0);
417 }
418
419 /*
420 * clocksource
421 */
ixp4xx_get_cycles(struct clocksource * cs)422 static cycle_t ixp4xx_get_cycles(struct clocksource *cs)
423 {
424 return *IXP4XX_OSTS;
425 }
426
427 static struct clocksource clocksource_ixp4xx = {
428 .name = "OSTS",
429 .rating = 200,
430 .read = ixp4xx_get_cycles,
431 .mask = CLOCKSOURCE_MASK(32),
432 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
433 };
434
435 unsigned long ixp4xx_timer_freq = IXP4XX_TIMER_FREQ;
436 EXPORT_SYMBOL(ixp4xx_timer_freq);
ixp4xx_clocksource_init(void)437 static void __init ixp4xx_clocksource_init(void)
438 {
439 init_sched_clock(&cd, ixp4xx_update_sched_clock, 32, ixp4xx_timer_freq);
440
441 clocksource_register_hz(&clocksource_ixp4xx, ixp4xx_timer_freq);
442 }
443
444 /*
445 * clockevents
446 */
ixp4xx_set_next_event(unsigned long evt,struct clock_event_device * unused)447 static int ixp4xx_set_next_event(unsigned long evt,
448 struct clock_event_device *unused)
449 {
450 unsigned long opts = *IXP4XX_OSRT1 & IXP4XX_OST_RELOAD_MASK;
451
452 *IXP4XX_OSRT1 = (evt & ~IXP4XX_OST_RELOAD_MASK) | opts;
453
454 return 0;
455 }
456
ixp4xx_set_mode(enum clock_event_mode mode,struct clock_event_device * evt)457 static void ixp4xx_set_mode(enum clock_event_mode mode,
458 struct clock_event_device *evt)
459 {
460 unsigned long opts = *IXP4XX_OSRT1 & IXP4XX_OST_RELOAD_MASK;
461 unsigned long osrt = *IXP4XX_OSRT1 & ~IXP4XX_OST_RELOAD_MASK;
462
463 switch (mode) {
464 case CLOCK_EVT_MODE_PERIODIC:
465 osrt = LATCH & ~IXP4XX_OST_RELOAD_MASK;
466 opts = IXP4XX_OST_ENABLE;
467 break;
468 case CLOCK_EVT_MODE_ONESHOT:
469 /* period set by 'set next_event' */
470 osrt = 0;
471 opts = IXP4XX_OST_ENABLE | IXP4XX_OST_ONE_SHOT;
472 break;
473 case CLOCK_EVT_MODE_SHUTDOWN:
474 opts &= ~IXP4XX_OST_ENABLE;
475 break;
476 case CLOCK_EVT_MODE_RESUME:
477 opts |= IXP4XX_OST_ENABLE;
478 break;
479 case CLOCK_EVT_MODE_UNUSED:
480 default:
481 osrt = opts = 0;
482 break;
483 }
484
485 *IXP4XX_OSRT1 = osrt | opts;
486 }
487
488 static struct clock_event_device clockevent_ixp4xx = {
489 .name = "ixp4xx timer1",
490 .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
491 .rating = 200,
492 .shift = 24,
493 .set_mode = ixp4xx_set_mode,
494 .set_next_event = ixp4xx_set_next_event,
495 };
496
ixp4xx_clockevent_init(void)497 static void __init ixp4xx_clockevent_init(void)
498 {
499 clockevent_ixp4xx.mult = div_sc(IXP4XX_TIMER_FREQ, NSEC_PER_SEC,
500 clockevent_ixp4xx.shift);
501 clockevent_ixp4xx.max_delta_ns =
502 clockevent_delta2ns(0xfffffffe, &clockevent_ixp4xx);
503 clockevent_ixp4xx.min_delta_ns =
504 clockevent_delta2ns(0xf, &clockevent_ixp4xx);
505 clockevent_ixp4xx.cpumask = cpumask_of(0);
506
507 clockevents_register_device(&clockevent_ixp4xx);
508 }
509